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M41T62 Fiches technique(PDF) 8 Page - STMicroelectronics |
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M41T62 Fiches technique(HTML) 8 Page - STMicroelectronics |
8 / 33 page M41T62/63/64/65 8/33 OPERATION The M41T6x clock operates as a slave device on the serial bus. Access is obtained by implementing a start condition followed by the correct slave ad- dress (D0h). The 16 bytes contained in the device can then be accessed sequentially in the following order: 1. Tenths/Hundredths of a Second Register 2. Seconds Register 3. Minutes Register 4. Hours Register 5. Square Wave/Day Register 6. Date Register 7. Century/Month Register 8. Year Register 9. Calibration Register 10. Watchdog Register 11 - 15. Alarm Registers 16. Flags Register 2-Wire Bus Characteristics The bus is intended for communication between different ICs. It consists of two lines: a bi-direction- al data signal (SDA) and a clock signal (SCL). Both the SDA and SCL lines must be connected to a positive supply voltage via a pull-up resistor. The following protocol has been defined: – Data transfer may be initiated only when the bus is not busy. – During data transfer, the data line must remain stable whenever the clock line is High. – Changes in the data line, while the clock line is High, will be interpreted as control signals. Accordingly, the following bus conditions have been defined: Bus not busy. Both data and clock lines remain High. Start data transfer. A change in the state of the data line, from high to Low, while the clock is High, defines the START condition. Stop data transfer. A change in the state of the data line, from Low to High, while the clock is High, defines the STOP condition. Data Valid. The state of the data line represents valid data when after a start condition, the data line is stable for the duration of the high period of the clock signal. The data on the line may be changed during the Low period of the clock signal. There is one clock pulse per bit of data. Each data transfer is initiated with a start condition and terminated with a stop condition. The number of data bytes transferred between the start and stop conditions is not limited. The information is transmitted byte-wide and each receiver acknowl- edges with a ninth bit. By definition a device that gives out a message is called “transmitter,” the receiving device that gets the message is called “receiver.” The device that controls the message is called “master.” The de- vices that are controlled by the master are called “slaves.” |
Numéro de pièce similaire - M41T62 |
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Description similaire - M41T62 |
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